Entertaiment refers to activities, such as watching plays or movies, or activities that provide pleasure. It is often linked to play, which in children develops a range of skills, and prepares them for adult activities such as rearing children or engaging in professional work (5). A well-known example of entertainment is the story of Scheherazade, from the Persian professional storytelling tradition (6), which has been retold in music by composers such as Rimsky-Korsakov and Ravel, in film by directors like Pasolini, and even in innovative video games (7).
You might abbreviate the word entertain to entmt on a flier or in industry news publications where space is at a premium. However, you should not use entmt in general prose.